IJET 2012 Vol.4(4): 396-399 ISSN: 1793-8244

Self-Excited Combustion Instability in Rijke-Zhao Tube with Bifurcating Branches

Zhiyuan Zhong and Dan Zhao

Abstract—Combustion instabilities are caused by a coupling between unsteady heat release and acoustic pressure waves, which is characterized by large amplitude pressure oscillations. In this work, combustion instability in a Rijke-Zhao tube is considered. It has a mother tube (bottom stem), which splits into two bifurcating daughter tubes (i.e. upper branches) with different lengths. As a premixed laminar flame is placed inside the mother tube, it provides a mechanism to produce self-excited combustion oscillations (also known as combustion instabilities). In order to investigate the Rijke-Zhao combustion instabilities, 2D numerical simulation of two different configurations of Rijke-Zhao tube by using Fluent 13.0 is conducted. Comparison is then made between numerical results and our experimental ones. Good agreement is observed.

Index Terms—Rijke-zhao tube, bifurcating branches, thermoacoustic oscillation, combustion instability.

The authors are with the Aerospace Engineering Division, Nanyang Technological University, 639798 Singapore(e-mail: zhaodan@ntu.edu.sg).

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Cite: Zhiyuan Zhong and Dan Zhao, "Self-Excited Combustion Instability in Rijke-Zhao Tube with Bifurcating Branches," International Journal of Engineering and Technology vol. 4, no. 4, pp. 396-399, 2012.